Alert archive / South Dakota / Mesoscale Discussions in 2020
Mesoscale Discussion 795
The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2020, 1:35 PM CDT for Keya Paha County, Nebraska; 21 counties in South Dakota. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jun 3, 2020, 1:35 PM CDT (18:35 UTC)
- Expired
- Jun 3, 2020, 3:00 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...severe thunderstorm watch likely
- Chance of a watch
- 80%
All 22 counties
Keya Paha County, NE, Bennett County, SD, Brule County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 88 km from the middle of the area, began a volume at 18:35 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.6 hours before the alert went out and 320 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 43 J/kg
- Mixed-layer CIN
- -541 J/kg
- Mixed-layer LCL
- 1875 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 7:35 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 85 min |
| Jun 3, 2:05 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Frontier, Hayes, Hitchcock, Perkins and 1 more | 85 min |
| Jun 3, 2:05 PM CDT | Severe Thunderstorm Watch | SPC | Blaine, Boyd, Brown, Cherry, Grant, Holt and 6 more | 6 hr |
| Jun 3, 3:56 PM CDT | Mesoscale Discussion | SPC | Blaine, Brown, Cherry, Dawes, Grant, Holt and 6 more | 2 hr |
| Jun 3, 5:53 PM CDT | Mesoscale Discussion | SPC | Adams, Blaine, Buffalo, Chase, Clay, Custer and 28 more | 3 hr |
| Jun 3, 6:18 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Arthur, Buffalo, Chase, Clay, Custer and 33 more | 6 hr |
Nearby
Mesoscale Discussions in South Dakota, 2020Mesoscale Discussions in Nebraska, 2020Every mesoscale discussion in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.